Process for the carbonylation of methanol or a reactive derivati

Details Process for the carbonylation of methanol or a reactive derivati Process for the carbonylation of methanol or a reactive derivati

1994-06-21

1996-01-30

Nazario-Gonzales, Porfirio

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

556 18, 556 20, 560232, 568 14, 568 15, 502166, C07C 5112, C07C 6736, C07F 1500, B01J 3100

Patent

active

054881536

ABSTRACT:
A process or the liquid phase carbonylation of methanol or a reactive derivative thereof comprises contacting carbon monoxide with a liquid reaction composition comprising methanol or a reactive derivative thereof, a halogen promoter and a rhodium catalyst system comprising a rhodium component and a bidentate phosphorus-sulphur ligand, the ligand comprising a phosphorus dative center linked to a sulphur dative or anionic center by a substantially unreactive backbone structure comprising two connecting carbon atoms or a connecting carbon and a connecting phosphorus atom. Novel rhodium ligand complexes of formula [Rh(CO)L].sub.m and Rh(CO)LY] wherein Y is a halogen, m is a number less than 10 and L is ##STR1## wherein the R groups are independently selected from C.sub.1 to C.sub.20 alkyl, cycloalkyl, aryl, substituted aryl and optionally substituted aralkyl; the R.sup.5 groups are selected from hydrogen, C.sub.1 to C.sub.20 alkyl, cycloalkyl, aryl, substituted aryl, aryl and optionally substituted aralkyl groups; the R.sup.1 to R.sup.4 groups are independently selected from hydrogen, C.sub.1 to C.sub.20 alkyl and optionally substituted aralkyl; X is a non-coordinating substitutent such as C.sub.1 to C.sub.20 alkyl, cycloalkyl, aryl, substituted aryl, C.sub.1 to C.sub.20 alkoxy, C.sub.1 to C.sub.20 alkylthio, trialkylsilyl or triarylsilyl, preferably, Si(CH.sub.3).sub.3 or methyl and n is 0 to 4 preferably 0 or 1.

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